\documentclass{article}
%\usepackage{pgfplots}
%\pgfplotsset{compat=newest}
%\pgfplotsset{plot coordinates/math parser=false}
\usepackage{setspace,subfigure}
\usepackage{tikz}
\usetikzlibrary{plotmarks}
\usetikzlibrary{lindenmayersystems}
\usetikzlibrary{decorations.pathmorphing}
\usepackage{geometry}
\geometry{verbose=false,papersize={10in,7in},body={10in,7in},marginratio={4:3, 2:3}}% marginratio={horizontal ratio,verticalratio}
\begin{document}
\thispagestyle{empty}
\null\vspace{0pt}
\hspace{0pt}

\begin{tikzpicture}[x=3cm,y=.002cm,font=\Huge]
\draw (1,0) -- coordinate (x axis mid) (8,0);
\draw (1,0) -- coordinate (y axis mid) (1,7000);
\foreach \x in {1,...,8}
     	\draw (\x,1pt) -- (\x,-3pt)
		node[anchor=north] {\x};
\foreach \y in {0,1000,...,7000}
     	\draw (86pt,\y) -- (82pt,\y) 
     	node[anchor=east] {\y};
\node[below=0.9cm] at (x axis mid) {Level};
\node[rotate=90, above=2cm] at (y axis mid) {Number of discretization points};
\draw plot[mark=*,mark size=10pt, mark options={fill=red}] file{ntpsevolution.txt}; % original nodes
\end{tikzpicture}
\end{document}
\end{document}